/* $Id: ParserFeatureSetterFactory.java 467222 2006-10-24 03:17:11Z markt $
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.tomcat.util.digester;

import java.util.Properties;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;

import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;

/**
 * Creates a <code>SAXParser</code> based on the underlying parser. Allows
 * logical properties depending on logical parser versions to be set.
 * 
 * @since 1.6
 */
public class ParserFeatureSetterFactory {

	/**
	 * <code>true</code> is Xerces is used.
	 */
	private static boolean isXercesUsed;

	static {
		try {
			// Use reflection to avoid a build dependency with Xerces.
			Class versionClass = Class
					.forName("org.apache.xerces.impl.Version");
			isXercesUsed = true;
		} catch (Exception ex) {
			isXercesUsed = false;
		}
	}

	/**
	 * Create a new <code>SAXParser</code>
	 * 
	 * @param properties
	 *            (logical) properties to be set on parser
	 * @return a <code>SAXParser</code> configured based on the underlying
	 *         parser implementation.
	 */
	public static SAXParser newSAXParser(Properties properties)
			throws ParserConfigurationException, SAXException,
			SAXNotRecognizedException, SAXNotSupportedException {

		if (isXercesUsed) {
			return XercesParser.newSAXParser(properties);
		} else {
			return GenericParser.newSAXParser(properties);
		}
	}

}